This 94-year-old traveled more than 300 miles each way just so she could vote
https://edition.cnn.com/2020/10/19/politics/elderly-woman-travels-300-miles-to-vote-trnd/index.html
I think that "mobile voting vehicle" would be necessary in rural part of the United States. It is the vehicle dropping in at areas where it's far away from the nearest polling place.